2025 Compare Climate & Weather:
St. Charles, IL vs Chattanooga, TN

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Highlights

On average, there are 207 sunny days per year in Chattanooga. St. Charles averages 189 sunny days per year. The US average is 205 sunny days.

Chattanooga, Tennessee gets 51.1 inches of rain, on average, per year. St. Charles, Illinois gets 37.7 inches of rain, on average, per year. The US average is 38.1 inches of rain per year.

Chattanooga averages 1.5 inches of snow per year. St. Charles averages 30.1 inches of snow per year. The US average is 27.8 inches of snow per year.

Weather Highlights

Chattanooga, Tennessee
Summer High: the July high is around 89 degrees
Winter Low: the January low is 28.9
Rain: averages 51.1 inches of rain a year
Snow: averages 1.5 inches of snow a year

St. Charles, Illinois
Summer High: the July high is around 84.5 degrees
Winter Low: the January low is 14.7
Rain: averages 37.7 inches of rain a year
Snow: averages 30.1 inches of snow a year

BestPlaces Comfort Index

Chattanooga

The annual BestPlaces Comfort Index for Chattanooga is 7.5 (10=best), which means it is one of the most pleasant places in Tennessee.

7.5 / 10

May, September and October are the most pleasant months in Chattanooga, while January and July are the least comfortable months.

St. Charles

The annual BestPlaces Comfort Index for St. Charles is 6.9 (10=best), which means it is less comfortable than most places in Illinois.

6.9 / 10

June, September and August are the most pleasant months in St. Charles, while January and December are the least comfortable months.

Today's Weather - St. Charles, IL

12 AM PST

Sunny

71°F

DAY	DESCRIPTION	HIGH / LOW	WIND
This Afternoon	Sunny	73° / 40°	NE 15 mph
Sunday	Sunny	75° / 51°	ENE 5 to 10 mph
Monday	Partly Sunny	80° / 59°	E 5 to 10 mph
Tuesday	Isolated Showers And Thunderstorms	79° / 59°	ESE 5 to 10 mph
Wednesday	Mostly Sunny then Isolated Showers And Thunderstorms	83° / 64°	SE 5 to 10 mph
Thursday	Mostly Sunny then Scattered Showers And Thunderstorms	88° / 63°	S 10 to 15 mph
Friday	Sunny then Slight Chance Rain Showers	83° / 56°	WSW 10 to 20 mph

Today's Weather - Chattanooga, TN

12 AM PST

Showers And Thunderstorms Likely

68°F

DAY	DESCRIPTION	HIGH / LOW	WIND
This Afternoon	Showers And Thunderstorms Likely	70° / 58°	E 5 mph
Sunday	Chance Showers And Thunderstorms	75° / 62°	E 0 to 5 mph
Monday	Showers And Thunderstorms	73° / 61°	SE 5 to 10 mph
Tuesday	Showers And Thunderstorms	74° / 60°	S 0 to 5 mph
Wednesday	Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms	81° / 65°	S 0 to 5 mph
Thursday	Mostly Sunny	87° / 69°	S 0 to 5 mph
Friday	Partly Sunny then Slight Chance Showers And Thunderstorms	89° / 68°	SW 0 to 5 mph

Average Monthly High / Low (°F)

Month	St. Charles, IL	Chattanooga, TN
January	31° / 15°	50° / 29°
February	35° / 18°	54° / 32°
March	47° / 28°	63° / 39°
April	60° / 38°	72° / 46°
May	71° / 48°	79° / 55°
June	81° / 58°	86° / 64°
July	85° / 63°	89° / 68°
August	82° / 62°	89° / 67°
September	75° / 53°	83° / 60°
October	63° / 41°	73° / 48°
November	48° / 31°	62° / 38°
December	34° / 19°	52° / 31°

Hot, Freezing, Rainy, Snowy Days: St. Charles / Chattanooga

Month	Hot Days	Freezing Days	Rainy Days	Snowy Days
January	0 / 0	29 / 20	9 / 9	7 / 0
February	0 / 0	25 / 15	8 / 9	5 / 0
March	0 / 0	21 / 8	10 / 9	3 / 0
April	0 / 0	8 / 2	12 / 8	1 / 0
May	1 / 1	1 / 0	12 / 8	0 / 0
June	4 / 8	0 / 0	11 / 9	0 / 0
July	6 / 13	0 / 0	9 / 9	0 / 0
August	3 / 13	0 / 0	10 / 8	0 / 0
September	1 / 4	0 / 0	8 / 7	0 / 0
October	0 / 0	5 / 2	10 / 6	0 / 0
November	0 / 0	16 / 9	10 / 8	1 / 0
December	0 / 0	27 / 17	11 / 9	6 / 0

July is the hottest month for St. Charles with an average high temperature of 84.5°, which ranks it as cooler than most places in Illinois. In St. Charles, there are 5 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for St. Charles are September, June and August.

July is the hottest month for Chattanooga with an average high temperature of 89.0°, which ranks it as warmer than most places in Tennessee. In Chattanooga, there are 4 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Chattanooga are May, September and October.

January has the coldest nighttime temperatures for St. Charles with an average of 14.7°. This is colder than most places in Illinois.

January has the coldest nighttime temperatures for Chattanooga with an average of 28.9°. This is one of the warmest places in Tennessee.

In St. Charles, there are 13.8 days annually when the high temperature is over 90°, which is cooler than most places in Illinois.

In Chattanooga, there are 39.0 days annually when the high temperature is over 90°, which is hotter than most places in Tennessee.

In St. Charles, there are 131.8 days annually when the nighttime low temperature falls below freezing, which is colder than most places in Illinois.

In Chattanooga, there are 71.4 days annually when the nighttime low temperature falls below freezing, which is one of the warmest places in Tennessee.

In St. Charles, there are 8.8 days annually when the nighttime low temperature falls below zero°, which is colder than most places in Illinois.

In Chattanooga, there are 0.1 days annually when the nighttime low temperature falls below zero°, which is one of the warmest places in Tennessee.

August is the wettest month in St. Charles with 4.7 inches of rain, and the driest month is January with 1.6 inches. The wettest season is Autumn with 34% of yearly precipitation and 14% occurs in Spring, which is the driest season. The annual rainfall of 37.7 inches in St. Charles means that it is drier than most places in Illinois.

December is the wettest month in Chattanooga with 4.9 inches of rain, and the driest month is October with 3.2 inches. The wettest season is Spring with 29% of yearly precipitation and 23% occurs in Autumn, which is the driest season. The annual rainfall of 51.1 inches in Chattanooga means that it is drier than most places in Tennessee.

May is the rainiest month in St. Charles with 12.2 days of rain, and February is the driest month with only 7.7 rainy days. There are 119.6 rainy days annually in St. Charles, which is rainier than most places in Illinois. The rainiest season is Summer when it rains 28% of the time and the driest is Spring with only a 23% chance of a rainy day.

December is the rainiest month in Chattanooga with 9.2 days of rain, and October is the driest month with only 6.3 rainy days. There are 99.0 rainy days annually in Chattanooga, which is one of the least rainy places in Tennessee. The rainiest season is Spring when it rains 28% of the time and the driest is Winter with only a 21% chance of a rainy day.

An annual snowfall of 30.1 inches in St. Charles means that it is snowier than most places in Illinois.

An annual snowfall of 1.5 inches in Chattanooga means that it is one of the least snowy places in Tennessee.

January is the snowiest month in St. Charles with 9.6 inches of snow, and 6 months of the year have significant snowfall.

January is the snowiest month in Chattanooga with 0.6 inches of snow, and 1 month of the year have significant snowfall.

DID YOU KNOW?

Many people confuse Weather and Climate, but they are different. Weather refers to the conditions of the atmosphere over a short period of time, while Climate refers to the conditions of the atmosphere over a long period of time.

Weather, more specifically, refers to how the atmosphere behaves and its effects on life and human activities. Most people think of Weather in terms of what can be observed: temperature, humidity, precipitation, and cloudy/sunny conditions. Weather conditions constantly change on a minute-to-minute basis.

Climate is a record of the average weather conditions for a given place over a long period of time, often referred to as Climate Normals. A 30-year period of record is a common requirement to be considered a Climate Normal.

Reviews for St. Charles 2 Reviews

Jill · Sherman Oaks, CA

re:

Over 16 years ago

Hi. I'd like to know if you still feel the same way about living in Broomfield. I went there this past July to check it out (along with Lafayette, Boulder (can't More

| Reply

NC For Me · Apex, NC

re:

Over 16 years ago

Apex is perfect for what you are looking for. It's close enough to Raleigh, Durham, Chapel Hill to find a job and Cary the next town over, is a little more expensive but More

| Reply

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Reviews for Chattanooga 2 Reviews

Jill · Sherman Oaks, CA

re:

Over 16 years ago

Hi. I'd like to know if you still feel the same way about living in Broomfield. I went there this past July to check it out (along with Lafayette, Boulder (can't More

| Reply

NC For Me · Apex, NC

re:

Over 16 years ago

Apex is perfect for what you are looking for. It's close enough to Raleigh, Durham, Chapel Hill to find a job and Cary the next town over, is a little more expensive but More

| Reply

Start Your Review of Chattanooga

See all reviews

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2025 Compare Climate & Weather:
St. Charles, IL vs Chattanooga, TN

Highlights

Weather Highlights

BestPlaces Comfort Index

Today's Weather - St. Charles, IL

Today's Weather - Chattanooga, TN

Average Monthly High / Low (°F)

Hot, Freezing, Rainy, Snowy Days: St. Charles / Chattanooga

January has the coldest nighttime temperatures for St. Charles with an average of 14.7°. This is colder than most places in Illinois.

January has the coldest nighttime temperatures for Chattanooga with an average of 28.9°. This is one of the warmest places in Tennessee.

In St. Charles, there are 13.8 days annually when the high temperature is over 90°, which is cooler than most places in Illinois.

In Chattanooga, there are 39.0 days annually when the high temperature is over 90°, which is hotter than most places in Tennessee.

In St. Charles, there are 131.8 days annually when the nighttime low temperature falls below freezing, which is colder than most places in Illinois.

In Chattanooga, there are 71.4 days annually when the nighttime low temperature falls below freezing, which is one of the warmest places in Tennessee.

In St. Charles, there are 8.8 days annually when the nighttime low temperature falls below zero°, which is colder than most places in Illinois.

In Chattanooga, there are 0.1 days annually when the nighttime low temperature falls below zero°, which is one of the warmest places in Tennessee.

An annual snowfall of 30.1 inches in St. Charles means that it is snowier than most places in Illinois.

An annual snowfall of 1.5 inches in Chattanooga means that it is one of the least snowy places in Tennessee.

January is the snowiest month in St. Charles with 9.6 inches of snow, and 6 months of the year have significant snowfall.

January is the snowiest month in Chattanooga with 0.6 inches of snow, and 1 month of the year have significant snowfall.

DID YOU KNOW?

Reviews for St. Charles 2 Reviews

Reviews for Chattanooga 2 Reviews

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2025 Compare Climate & Weather:St. Charles, IL vs Chattanooga, TN

Highlights

Weather Highlights

BestPlaces Comfort Index

Today's Weather - St. Charles, IL

Today's Weather - Chattanooga, TN

Average Monthly High / Low (°F)

Hot, Freezing, Rainy, Snowy Days: St. Charles / Chattanooga

January has the coldest nighttime temperatures for St. Charles with an average of 14.7°. This is colder than most places in Illinois.January has the coldest nighttime temperatures for Chattanooga with an average of 28.9°. This is one of the warmest places in Tennessee.

In St. Charles, there are 13.8 days annually when the high temperature is over 90°, which is cooler than most places in Illinois.In Chattanooga, there are 39.0 days annually when the high temperature is over 90°, which is hotter than most places in Tennessee.

In St. Charles, there are 131.8 days annually when the nighttime low temperature falls below freezing, which is colder than most places in Illinois.In Chattanooga, there are 71.4 days annually when the nighttime low temperature falls below freezing, which is one of the warmest places in Tennessee.

In St. Charles, there are 8.8 days annually when the nighttime low temperature falls below zero°, which is colder than most places in Illinois.In Chattanooga, there are 0.1 days annually when the nighttime low temperature falls below zero°, which is one of the warmest places in Tennessee.

An annual snowfall of 30.1 inches in St. Charles means that it is snowier than most places in Illinois.An annual snowfall of 1.5 inches in Chattanooga means that it is one of the least snowy places in Tennessee.

January is the snowiest month in St. Charles with 9.6 inches of snow, and 6 months of the year have significant snowfall.January is the snowiest month in Chattanooga with 0.6 inches of snow, and 1 month of the year have significant snowfall.

DID YOU KNOW?

Reviews for St. Charles 2 Reviews

Reviews for Chattanooga 2 Reviews

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2025 Compare Climate & Weather:
St. Charles, IL vs Chattanooga, TN

January has the coldest nighttime temperatures for St. Charles with an average of 14.7°. This is colder than most places in Illinois.

January has the coldest nighttime temperatures for Chattanooga with an average of 28.9°. This is one of the warmest places in Tennessee.

In St. Charles, there are 13.8 days annually when the high temperature is over 90°, which is cooler than most places in Illinois.

In Chattanooga, there are 39.0 days annually when the high temperature is over 90°, which is hotter than most places in Tennessee.

In St. Charles, there are 8.8 days annually when the nighttime low temperature falls below zero°, which is colder than most places in Illinois.

In Chattanooga, there are 0.1 days annually when the nighttime low temperature falls below zero°, which is one of the warmest places in Tennessee.

An annual snowfall of 30.1 inches in St. Charles means that it is snowier than most places in Illinois.

An annual snowfall of 1.5 inches in Chattanooga means that it is one of the least snowy places in Tennessee.

January is the snowiest month in St. Charles with 9.6 inches of snow, and 6 months of the year have significant snowfall.

January is the snowiest month in Chattanooga with 0.6 inches of snow, and 1 month of the year have significant snowfall.